package com.bdqn.common.utils;

import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.Random;

public class VerifyCodeUtil {
    /**
     * 验证码规则字符串，去掉了1,0,i,o几个容易混淆的字符
     */
    public static final String VERIFY_CODES = "23456789ABCDEFGHJKMNPQRSTUVWXYZabcdefghjkmnpqrstuvwxyz";

    //开始登录 开始获取买号
    public static final int SUCCESS=0;
    //登录成功
    public static final int LOGIN_SUCCESS=1;
    //获取买号成功
    public static final int BUYER_SUCCESS=2;
    //获取登录用户ID 成功
    public static final int LOGINUSER_SUCCESS=3;
    //接单成功
    public static final int ORDER_SUCCESS=4;
    //账号密码错误
    public static final int LOGIN_ERROR=-1;
    //获取买号失败
    public static final int BUYER_ERROR=-2;
    //获取登录用户ID 失败
    public static final int LOGINUSER_ERROR=-3;
    //接单失败
    public static final int ORDER_ERROR=-4;
    //20秒重试
    public static final int ORDER_Excp=-5;
    //获取买号成功不带验证码
    public static final int BUYER_SUCCESSNOCODE=6;
    // 接单或登录异常
    public static final int EXCEPTION=-6;

    /**
     * 验证码规则字符串，纯数字
     */
    public static final String VERIFY_CODES_NUM = "0123456789";


    private static Random random = new Random();

    /**
     * 使用系统默认字符源生成验证码
     * @param verifySize 验证码长度
     * @return
     */
    public static String generateVerifyCode(int verifySize) {
        return generateVerifyCode(verifySize, VERIFY_CODES);
    }

    /**
     * 指定生成验证码的类型
     * @param verifySize 验证码长度
     * @param isNum 是否纯数字
     * @return
     */
    public static String generateVerifyCode(int verifySize,boolean isNum) {
        String sources;
        if(isNum){
            sources = VERIFY_CODES_NUM;
        }else {
            sources = VERIFY_CODES;
        }
        return generateVerifyCode(verifySize, sources);
    }

    /**
     * 使用指定源生成验证码
     * @param verifySize 验证码长度
     * @param sources    验证码字符源
     * @return
     */
    public static String generateVerifyCode(int verifySize, String sources) {
        if (sources == null || sources.length() == 0) {
            sources = VERIFY_CODES;
        }
        int codesLen = sources.length();
        Random rand = new Random(System.currentTimeMillis());
        StringBuilder verifyCode = new StringBuilder(verifySize);
        for (int i = 0; i < verifySize; i++) {
            verifyCode.append(sources.charAt(rand.nextInt(codesLen - 1)));
        }
        return verifyCode.toString().toLowerCase();
    }
    /**
     * 生成随机验证码文件,并返回验证码值
     * @param w
     * @param h
     * @param file
     * @param verifySize
     * @return
     * @throws IOException
     */
    public static String outputVerifyImage(int w, int h, File file, int verifySize) throws IOException {
        String verifyCode = generateVerifyCode(verifySize);
        outputImage(w, h, file, verifyCode);
        return verifyCode;
    }


    /**
     * 生成验证码
     * @param w
     * @param h
     * @param code
     * @return
     */
    public static BufferedImage getImage(int w, int h, String code) {
        int verifySize = code.length();
        BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Random rand = new Random();
        Graphics2D g2 = image.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        Color[] colors = new Color[5];
        Color[] colorSpaces = new Color[]{Color.WHITE, Color.CYAN,
                Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
                Color.PINK, Color.YELLOW};
        float[] fractions = new float[colors.length];
        for (int i = 0; i < colors.length; i++) {
            colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
            fractions[i] = rand.nextFloat();
        }
        Arrays.sort(fractions);
        // 设置边框色
        g2.setColor(Color.GRAY);
        g2.fillRect(0, 0, w, h);

        Color c = getRandColor(200, 250);
        // 设置背景色
        g2.setColor(c);
        g2.fillRect(0, 2, w, h - 4);

        //绘制干扰线
        Random random = new Random();
        // 设置线条的颜色
        g2.setColor(getRandColor(160, 200));
        for (int i = 0; i < 20; i++) {
            int x = random.nextInt(w - 1);
            int y = random.nextInt(h - 1);
            int xl = random.nextInt(6) + 1;
            int yl = random.nextInt(12) + 1;
            g2.drawLine(x, y, x + xl + 40, y + yl + 20);
        }

        // 添加噪点,噪声率
        float yawpRate = 0.05f;
        int area = (int) (yawpRate * w * h);
        for (int i = 0; i < area; i++) {
            int x = random.nextInt(w);
            int y = random.nextInt(h);
            int rgb = getRandomIntColor();
            image.setRGB(x, y, rgb);
        }
        // 使图片扭曲
        shear(g2, w, h, c);

        g2.setColor(getRandColor(100, 160));
        int fontSize = h - 4;
        Font font = new Font("Algerian", Font.ITALIC, fontSize);
        g2.setFont(font);
        char[] chars = code.toCharArray();
        for (int i = 0; i < verifySize; i++) {
            AffineTransform affine = new AffineTransform();
            affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize / 2, h / 2);
            g2.setTransform(affine);
            g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + fontSize / 2 - 10);
        }

        g2.dispose();
        return image;
    }


    private static Color getRandColor(int fc, int bc) {
        if (fc > 255) {
            fc = 255;
        }
        if (bc > 255) {
            bc = 255;
        }

        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }

    private static int getRandomIntColor() {
        int[] rgb = getRandomRgb();
        int color = 0;
        for (int c : rgb) {
            color = color << 8;
            color = color | c;
        }
        return color;
    }

    private static int[] getRandomRgb() {
        int[] rgb = new int[3];
        for (int i = 0; i < 3; i++) {
            rgb[i] = random.nextInt(255);
        }
        return rgb;
    }

    private static void shear(Graphics g, int w1, int h1, Color color) {
        shearX(g, w1, h1, color);
        shearY(g, w1, h1, color);
    }

    private static void shearX(Graphics g, int w1, int h1, Color color) {

        int period = random.nextInt(2);

        boolean borderGap = true;
        int frames = 1;
        int phase = random.nextInt(2);

        for (int i = 0; i < h1; i++) {
            double d = (double) (period >> 1)
                    * Math.sin((double) i / (double) period
                    + (6.2831853071795862D * (double) phase)
                    / (double) frames);
            g.copyArea(0, i, w1, 1, (int) d, 0);
            if (borderGap) {
                g.setColor(color);
                g.drawLine((int) d, i, 0, i);
                g.drawLine((int) d + w1, i, w1, i);
            }
        }
    }

    private static void shearY(Graphics g, int w1, int h1, Color color) {
        int period = random.nextInt(40) + 10;
        boolean borderGap = true;
        int frames = 20;
        int phase = 7;
        for (int i = 0; i < w1; i++) {
            double d = (double) (period >> 1)
                    * Math.sin((double) i / (double) period
                    + (6.2831853071795862D * (double) phase)
                    / (double) frames);
            g.copyArea(i, 0, 1, h1, 0, (int) d);
            if (borderGap) {
                g.setColor(color);
                g.drawLine(i, (int) d, i, 0);
                g.drawLine(i, (int) d + h1, i, h1);
            }
        }
    }

    /**
     * 输出指定验证码图片流
     * @param w
     * @param h
     * @param
     * @param code
     * @throws IOException
     */
    public static BufferedImage outputImage(int w, int h, File file, String code) throws IOException {
        BufferedImage image = getImage(w, h, code);
        ImageIO.write(image, "jpg", file);
        return image;
    }

    /**
     * 输出指定验证码图片流
     * @param w
     * @param h
     * @param
     * @param code
     * @throws IOException
     */
    public static BufferedImage outputImage(int w, int h, ByteArrayOutputStream bs, String code) throws IOException {
        BufferedImage image = getImage(w, h, code);
        ImageIO.write(image, "jpg", bs);
        return image;
    }

    /**
     * 保存验证码图片到本地
     * @param verifyCode
     * @return 图片转Base64
     * @throws IOException
     */
    public static String codeFile(String verifyCode) throws IOException {
        File file = new File("H:/verifies/image.jpg");
        BufferedImage image = outputImage(45 * verifyCode.length(), 80, file, verifyCode);
        ByteArrayOutputStream bs = new ByteArrayOutputStream();
        ImageIO.write(image, "jpg", bs);
        //返回Base64编码过的字节数组字符串
        return Base64.encode(bs.toByteArray());
    }

    /**
     * 不保存验证码图片到本地
     * @param verifyCode
     * @return 图片转Base64
     * @throws IOException
     */
    public static String notCodeFile(String verifyCode) throws IOException {
        ByteArrayOutputStream bs = new ByteArrayOutputStream();
        BufferedImage image = outputImage(45 * verifyCode.length(), 80, bs, verifyCode);
        ImageIO.write(image, "jpg", bs);
        return Base64.encode(bs.toByteArray());
    }

}
